I would like to have an option to return audio only to the remote guest. Currently you can set the return feed to none, however the caller doesn't hear any audio or video when this option is selected. I wish there was an option to send an audio only return feed. This would be good for when the caller has limited bandwidth on their end. And in my case, I sometimes produce remotely by using TeamViewer to remote into the PC that is running vMix and then calling in via vMix Call. However since I am already seeing vMix, I wouldn't need return video, just return audio.